Reflection.Emit usage

[Mick]

Hello all!
Can anybody provide a good example for the Reflectio.Emitl namespace
usage? The problem I'm trying to solve is copying the method body from
existing class to newly created one.
Below is the code targeting .Net 2.0 , that I'm trying to use without
success:

class TemplateOne
{
public void PrintTemplateOn e()
{
Console.WriteLi ne("I'm the method of template #1");
}
}

class TemplateTwo
{
public void PrintTemplateTw o()
{
Console.WriteLi ne("I'm the method of template #2");
}
}

public interface IOneAndTwo
{
void PrintTemplateOn e();
void PrintTemplateTw o();
}

class Program
{
static void Main(string[] args)
{
AssemblyName newAssemName = new
AssemblyName("F romTwoTemplates ");
AssemblyBuilder asmBuilder =
Thread.GetDomai n().DefineDynam icAssembly(newA ssemName,
AssemblyBuilder Access.Run);
ModuleBuilder moduleBuilder =
asmBuilder.Defi neDynamicModule ("FromTwoTempla tes");
TypeBuilder newType =
moduleBuilder.D efineType("TwoT emplatesMethods ",
TypeAttributes. Class | TypeAttributes. Public);
newType.AddInte rfaceImplementa tion(typeof(IOn eAndTwo));

MethodBuilder method1Builder =
newType.DefineM ethod(typeof(IO neAndTwo).GetMe thods()[0].Name,
MethodAttribute s.Public | MethodAttribute s.Virtual,
typeof(IOneAndT wo).GetMethods( )[0].ReturnType,

GetParameterTyp es(typeof(IOneA ndTwo).GetMetho ds()[0].GetParameters( )));

MethodBody mb =
typeof(Template One).GetMethods ()[0].GetMethodBody( );
method1Builder. CreateMethodBod y(mb.GetILAsByt eArray(),
mb.GetILAsByteA rray().Length);

MethodBuilder method2Builder =
newType.DefineM ethod(typeof(IO neAndTwo).GetMe thods()[1].Name,
MethodAttribute s.Public | MethodAttribute s.Virtual,
typeof(IOneAndT wo).GetMethods( )[1].ReturnType,

GetParameterTyp es(typeof(IOneA ndTwo).GetMetho ds()[1].GetParameters( )));

mb = typeof(Template Two).GetMethods ()[0].GetMethodBody( );
method2Builder. CreateMethodBod y(mb.GetILAsByt eArray(),
mb.GetILAsByteA rray().Length);

newType.DefineM ethodOverride(m ethod1Builder,
typeof(IOneAndT wo).GetMethods( )[0]);
newType.DefineM ethodOverride(m ethod2Builder,
typeof(IOneAndT wo).GetMethods( )[1]);

Type created = newType.CreateT ype();

IOneAndTwo oneTwo1 = asmBuilder.Crea teInstance(newT ype.Name)
as IOneAndTwo;

Console.WriteLi ne("Copied methods:");
oneTwo1.PrintTe mplateOne();
oneTwo1.PrintTe mplateTwo();
Console.ReadKey ();
}

private static Type[] GetParameterTyp es(ParameterInf o[]
parameterInfo)
{
Type[] paramTypes = new Type[parameterInfo.L ength];
for (int i = 0; i < parameterInfo.L ength; i++)
{
paramTypes[i] = parameterInfo[i].ParameterType;
}
return paramTypes;
}
}

When it comes to the first method invocation (PrintTemplateO ne) I get
the following exception:

System.BadImage FormatException was unhandled
Message="Bad method token."
Source="FromTwo Templates"
StackTrace:
at TwoTemplatesMet hods.PrintTempl ateOne()
at ReflectionTest. Program.Main(St ring[] args) in
D:\Documents\Vi sual Studio
2005\Projects\R eflectionTest\R eflectionTest\P rogram.cs:line 50
at System.AppDomai n.nExecuteAssem bly(Assembly assembly, String[]
args)
at System.AppDomai n.ExecuteAssemb ly(String assemblyFile,
Evidence assemblySecurit y, String[] args)
at
Microsoft.Visua lStudio.Hosting Process.HostPro c.RunUsersAssem bly()
at System.Threadin g.ThreadHelper. ThreadStart_Con text(Object
state)
at System.Threadin g.ExecutionCont ext.Run(Executi onContext
executionContex t, ContextCallback callback, Object state)
at System.Threadin g.ThreadHelper. ThreadStart()

Any advices?

Thanks in advance
Mick